NTC thermistors for
temperature measurement
Leadless NTCs
Series/Type:
Date:
B57820M
March 2013
© EPCOS AG 2015. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Temperature measurement and compensation
Leadless NTCs
B57820M
M820
Applications
Temperature measurement and
compensation
Features
Front surfaces silver-plated
For clamp contacting
UL approval (E69802)
Options
Alternative resistance ratings, rated
temperatures, resistance tolerances and disk
geometries available on request.
Delivery mode
Bulk
Dimensional drawing
R
100
(Ω)
39.6
77
92
∅d
(mm)
5.1 1.1
5.3
±0.3
5.1 1.1
th (mm)
2.2 1.4
1.3
±0.2
2.2 1.4
Approx. weight 0.1 g
General technical data
Climatic category
Max. power
Resistance tolerance
Rated temperature
Dissipation factor
Thermal cooling time constant
Heat capacity
(IEC 60068-1)
(at 25
°C)
55/155/21
180
±5
100
approx. 3
approx. 30
approx. 90
(in air)
(in air)
P
25
∆R
R
/R
R
T
R
δ
th1)
τ
c1)
C
th1)
mW
%
°C
mW/K
s
mJ/K
Electrical specification and ordering codes
R
100
Ω
39.6
77
92
R
25
Ω
560.2
843.2
1014
No. of R/T
characteristic
1009
1006
1008
B
25/100
K
3930
±1.5%
3550
±1.5%
3560
±1.5%
Ordering code
B57820M0561A005
B57820M0841A004
B57820M0102A003
1) Depends on mounting situation
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 18
Temperature measurement and compensation
Leadless NTCs
B57820M
M820
Reliability data
Test
Storage in
dry heat
Standard
IEC
60068-2-2
Test conditions
∆R
25
/R
25
(typical)
< 3%
Remarks
No visible
damage
Storage in damp
heat, steady state
Rapid temperature
cycling
Endurance
Long-term stability
(empirical value)
Note
Storage at upper
category temperature
T: 155
°C
t: 1000 h
IEC
Temperature of air: 40
°C
60068-2-78 Relative humidity of air: 93%
Duration: 21 days
IEC
Lower test temperature: 55
°C
60068-2-14 Upper test temperature: 155
°C
Number of cycles: 100
P
max
: 180 mW
t: 1000 h
Temperature: 70
°C
t: 10000 h
< 3%
No visible
damage
No visible
damage
No visible
damage
No visible
damage
< 3%
< 3%
< 5%
Contact of NTC thermistors with any liquids and solvents shall be prevented. It must be
ensured that no water enters the NTC thermistors (e.g. through plug terminals).
Avoid dewing and condensation unless thermistor is specified for these conditions.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 18
Temperature measurement and compensation
Leadless NTCs
B57820M
M820
R/T characteristics
R/T No.
T (°C)
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
80.0
85.0
90.0
95.0
100.0
105.0
110.0
115.0
120.0
125.0
130.0
135.0
140.0
145.0
150.0
155.0
1006
1008
1009
B
25/100
= 3550 K
B
25/100
= 3560 K
B
25/100
= 3930 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
48.503
36.524
27.639
21.021
16.069
12.348
9.5313
7.4185
5.778
4.5373
3.5762
2.8409
2.2739
1.833
1.4883
1.216
1.0000
0.82627
0.686
0.57254
0.4805
0.40514
0.34213
0.29036
0.24838
0.21342
0.18371
0.15873
0.13756
0.11961
0.10435
0.091314
0.080265
0.070764
0.062544
0.055431
0.049252
0.043872
0.039254
0.035209
0.031581
0.028389
0.025614
5.8
5.7
5.6
5.5
5.4
5.3
5.1
5.1
4.9
4.9
4.7
4.5
4.4
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
3.0
2.9
2.8
2.8
2.7
2.6
2.6
2.5
2.4
2.4
2.3
2.3
2.2
2.2
2.2
2.1
2.0
53.104
39.318
29.325
22.03
16.666
12.696
9.7251
7.5171
5.8353
4.5686
3.605
2.8665
2.2907
1.8438
1.492
1.2154
1.0000
0.82976
0.68635
0.57103
0.48015
0.40545
0.3417
0.28952
0.24714
0.21183
0.18194
0.1568
0.13592
0.11822
0.1034
0.090741
0.079642
0.070102
0.061889
0.054785
0.048706
0.043415
0.038722
0.034615
0.031048
0.02791
0.025193
6.1
6.0
5.8
5.7
5.5
5.4
5.2
5.1
4.9
4.8
4.7
4.5
4.4
4.3
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.1
3.0
2.9
2.8
2.8
2.7
2.6
2.6
2.5
2.4
2.4
2.3
2.3
2.2
2.2
2.1
2.1
2.0
85.423
60.781
43.65
31.629
23.118
17.04
12.649
9.4864
7.1545
5.4479
4.1732
3.2256
2.5147
1.9763
1.5649
1.2481
1.0000
0.80956
0.65726
0.53697
0.44169
0.36534
0.30327
0.25313
0.21271
0.17962
0.15219
0.12949
0.11067
0.094952
0.08178
0.07069
0.061383
0.053486
0.04673
0.040955
0.036006
0.031747
0.028097
0.024935
0.022176
0.019772
0.017683
7.0
6.8
6.6
6.4
6.2
6.1
5.9
5.8
5.6
5.4
5.2
5.1
4.9
4.8
4.6
4.5
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.5
3.4
3.4
3.3
3.2
3.1
3.0
3.0
2.9
2.8
2.7
2.7
2.6
2.5
2.5
2.4
2.4
2.3
2.3
2.2
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 18
Temperature measurement and compensation
Leadless NTCs
B57820M
M820
R/T No.
T (°C)
160.0
165.0
170.0
175.0
180.0
185.0
190.0
195.0
200.0
205.0
210.0
215.0
220.0
225.0
230.0
235.0
240.0
245.0
250.0
1006
1008
1009
B
25/100
= 3550 K
B
25/100
= 3560 K
B
25/100
= 3930 K
R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K) R
T
/R
25
α
(%/K)
0.02279
2.0
0.020667
2.0
0.01878
0.01709
0.015582
0.014227
0.013012
0.011934
0.010964
0.0101
0.0093191
0.0085949
0.0079384
0.0073411
0.006798
0.0063087
0.0058623
0.0054487
0.0050705
1.9
1.9
1.8
1.8
1.8
1.7
1.7
1.7
1.6
1.6
1.6
1.5
1.5
1.5
1.5
1.4
1.4
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 18
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